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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a192fa9e7425250db539476b45c93fda78ff36e16bac0e6b558dc8e65da01388' 
  AND token = 'M5zuDgagc2zzXbAjbpB4s3iw2/S8KfzL7OGH96XovgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}